Tata Docomo — SMS Alert charges deducted from Prepaid talktime balance without informing about service subscription

Address:

Mumbai City, Maharashtra

Tata DoCoMo has deducted Local News SMS Alert chagres from my pre-paid balance talktime.
This was done without me subscribing to the service.
After i registered a complaint with them on Customer Care, they gave me a complaint number and said the money will be refunded to you on 21st December, 2010 before 20.00hrs.
However, till now the money was not refunded and after i enquired again about refund of money, i was told, since you have received SMS Alert messages earlier even after lodging the complaint, the rended money was paid as charges for received messages. Again this was done without my information.
Also, the SMS Alert service has not been de-activated till now.

In short, Tata DoCoMo is cheating its subscribers and not refunding the money.

What should i do to recover my money ?